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In this work, the regioselectivity of different Baeyer-Villiger monooxygenases (BVMOs) for the conversion of selected substrates was reversed or improved by protein engineering. These studies highlight the importance of substrate positioning for the regioselectivity and that the position of the substrate can be efficiently influenced by introducing proper mutations. It was shown that the beneficial mutations for all BVMOs were partly in corresponding positions. Additionally, the sulfoxidation activity and the stability of BVMOs were targeted and improved by applying protein engineering.